Solved the mystery today. Found another one with a note inside. It's by Peter Snagge who passed away in 2013. He trained under Henry Hammond at Farnham, and then Bernard Leach at St Ives and Michael Cardew, before moving to Alresford and setting up his Tichborne Pottery near Alresford. Quote is from an eBay listing for large brown jug with the same cross mark cartouche.